Volume -Data at Rest (Scale of Data)
The main characteristic that makes data "big" is the sheer volume. It makes no sense to focus on minimum storage units because the total amount of information is growing exponentially every year. In 2010, Thomson Reuters estimated in its annual report that it believed the world was "awash with over 800 exabytes of data and growing."
For that same year, EMC, a hardware company that makes data storage devices, thought it was closer to 900 exabytes and would grow by 50 percent every year. No one really knows how much new data is being generated, but the amount of information being collected is huge.
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